KB Pistons

NEW FORGED APPLICATIONS

FORGED Sportster 1200 and 883 to 1200 Conv. FLAT TOP WITH VALVE POCKETS FOR BOTH 1200 AND 883 HEADS

Part #

Stroke

Comp Hgt.

CC

Comp. Ratio

Bore

KB935C

3.488”

3.812”

1.208”

+3

SEE NOTE

Used as 883cc to 1200cc conversion piston with an 883cc 51cc head - 11:1 Used with 1200cc head with a 69cc chamber - 9:1 Oversizes: STD .005 .010 .020 .030 .040 NOTE

FORGED Big Bore 93” Shovelhead 4-1/2” STROKE WITH STOCK LENGTH CYLINDERS

Part #

Stroke

Comp Hgt.

CC

Comp. Ratio

Bore

KB658C KB659C

3.625” 3.625”

4.500” 4.500”

1.175” 1.175”

-42.3 -53.6

8:1

10.2:1

Designed to work with stock 5.330” length cylinders, no stroker plates required. Compression ratios are calculated with piston .085” below top of cylinder. Oversizes: STD .005 .010 .020 .030 .040

FORGED Twin Cam 103” 10:1 WITH SCREAMIN’ EAGLE! 95cc HEADS

Part #

Stroke

Comp Hgt.

CC

Comp. Ratio

Bore

KB660C

3.875”

4.375”

1.076”

-8.8

10:1

True 10:1 with Screamin’ Eagle (MVA) Maximum Velocity Area Heads. Ring Pack: 1.5mm 1.5mm 2.5mm Oversizes: STD .005 .010 .020 .030

FORGED Twin Cam 110” 10:1 WITH SCREAMIN’ EAGLE! 95cc HEADS

Part #

Stroke

Comp Hgt.

CC

Comp. Ratio

Bore

KB661C

4.000”

4.375”

1.076”

-4.2

10:1

True 10:1 with Screamin’ Eagle (MVA) Maximum Velocity Area Heads. Ring Pack: 1.5mm 1.5mm 2.5mm Oversizes: STD .005 .010 .020 .030

ALL KB FORGED PISTONS ARE MADE WITH 4032 ALLOY AND HAVE OFFSET WRIST PINS.

KB Performance Motorcycle Pistons Division of United Engine & Machine Co. Inc. 1040 Corbett St. — Carson City, NV 89706

PHONE: 800-648-7970 or 775-882-7790 — FAX: 775-882-7773 EMAIL: tech@uempistons.com — WEB: www.uempistons.com

TABLE OF CONTENTS

Tech Tips & Installation . . . . . . . . . . . . . . . . . . . . . . . .2 Shovelhead Installation Tips . . . . . . . . . . . . . . . . . . . .5 Hypereutectic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Sportster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Knuckle, Pan and Shovelhead . . . . . . . . . . . . . . . . .8 Twin Cam 88” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Twin Cam 96” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Indian . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Forged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Evo-Sportster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Knuckle, Pan and Shovelhead . . . . . . . . . . . . . . . .12 Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Twin Cam 88” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Twin Cam 96” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Application Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Numerical Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Diametrical Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

United Engine & Machine Co. Inc. 1040 Corbett St. — Carson City, NV 89706 PHONE: 800-648-7970 or 775-882-7790 FAX: 775-882-7773

EMAIL: tech@uempistons.com WEB: www.uempistons.com

SELECTING THE PISTON ALLOY FOR YOUR APPLICATION KB Performance Pistons are offered in two materials: Hypereutectic cast 390 Alloy found in ORANGE Section Forged 4032 Alloy found in GRAY Section

Warranty Disclaimer Due to the nature of performance applications, the parts sold by United Engine & Machine Co. Inc. are sold without any express warranty or any implied warranty of mer- chantability or fitness for a particular purpose. UEM shall not, under any circumstances, be liable for any special, incidental or consequential damages, including, but not lim- ited to damage, or loss of profits or revenue, cost of purchased or replacement goods, or claims of customers of the purchaser, which may arise and/or result from sale, installation or use of these parts. UEM reserves the right to make product improvements or changes without notice and without incurring liability with respect to similar products previously manufactured. The information contained in this instruction should not be considered absolute. Final decisions concerning the installation and use of these products are ultimately the re- sponsibility of the customer. UEM makes no guarantee of warranty on emissions. Hypereutectic Alloy is a cast 16% high silicon content material that has very high thermal barrier proper- ties along with a low thermal expansion rate. This alloy is perfectly suited for an air-cooled engine. Tight piston-to- cylinder clearances are used to achieve better ring seal and a quiet running engine. Hypereutectics are best suited for Street Bikes using stock or mild compression ratios to 10.5:1 running on pump fuel. With the high silicon content, these pistons will resist skirt wear the best. Models that end in a “C” come with Anti-Friction skirt coating. Forged 4032 Alloy is an 11% silicon alloy that is formed in a forging press then fully machined. The combi- nation of this alloy and forging process allows the piston to flex under detonation or pre-ignition, giving the best re- sistance to cracking. Since 4032 alloy has a low expansion rate but higher than Hypereutectic, it will require about a .001” wider piston to wall clearance. Forged pistons are suited for Street or Race with power adders such as NOS or boost. Models that end in a “C” come with Anti-Friction skirt coating.

TECH TIPS & INSTALLATION

Hypereutectic Motorcycle Application Your KB Hypereutectic motorcycle pistons are made from a high silicon aluminum alloy. Hypereutectic alloys have less thermal expan- sion and lower thermal conductivity than a typical cast or forged piston alloy. In addition to greater thermal properties, Hypereutectic alloys have 16% silicon which gives superior wear properties. The low thermal conductivity of this alloy requires engines running hypereutectic pistons to reduce total ignition timing 2 to 4 degrees. KB Forged Motorcycle Application KB’s Forged motorcycle line is supplied in 4032 alloy in new lightweight designs. It is important to remember that specifications for hypereutectic and forged applications be kept separate. Clearances MINIMUM PISTON TO WALL CLEARANCE The spreadsheet below is for general clearance guidelines for KB Pistons, but final sizing needs to be based on your application and conditions. Hypereutectic Bore Size Forged Bore Size Under 4.00” Under 4.125” 4.125” & Above Aluminum Cyl w/ Steel Sleeve .0015” Aluminum Cyl w/ Steel Sleeve .0025” .0030” Cast Iron Cylinder .0020” Cast Iron Cylinder .0025” N/A

Special note on STANDARD size pistons: .001" less clearance is built into the piston to allow honing of a good STANDARD bore cyl. New cylinders must be checked for proper wall clearance and may require slight honing.

IMPORTANT!!! Ring end gaps MUST be checked for proper gap opening. Multiply bore size by the ring end gap factor listed below for your application (i.e. 3.498” X .0065” = .022” gap)

MINIMUM TOP RING END GAP FACTORS

Application

Hypereutectic

Forged

Stock / Light Bike Hi Comp / Touring

.0065”

.004”

.008” .010”

.0055”

Boosted

.006”

MINIMUM SECOND RING END GAP FACTORS

All

.004”

.004”

KB Hypereutectic and Premium Forged Motorcycle Pistons Nominal Clearances The following standards are used on all KB Hypereutectic and Premium forged motorcycle non- coated pistons. All KB motorcycle pistons come with clearance built into the piston. An example is a 3.498” hypereutectic piston at .010” over would have the cylinder bored to 3.508” and we would supply the piston at 3.5065” for a clearance of .0015”. Final piston clearance should be based solely on the demands of your application. Consideration should be given to such things as com- ponents being used, demands of the application, climatic conditions, fuel, desired compression ratio, just to mention a few. Typically, additional clearance is honed into the cylinder if more de-

Coated Piston Note: Do NOT measure over coating

manding applications are intended, and there may be cases where reduced clearance is acceptable. The chart above is for general clearance guidelines, but final sizing needs to be made based on your conditions. Hypereutectic and forged applications have dif- ferent minimum clearance requirements. Calculating Compression Ratios When calculating compression ratios, KB treats a dish designed piston as a positive number. This is because a dish adds volume to the cylinder head. All KB dish pistons receive a positive cc volume. The reverse is true for all dome style pistons. Since the dome re- moves volume from the cylinder head we give all domes a negative cc volume. Remember this when calculating compression using the KB calculator on our website uempistons.com.

Hypereutectic Alloy | Forged

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TECH TIPS & INSTALLATION , continued

Spiral lock rings – used in all series: 1. Spring the lock about ½” to ¾” to get your thumb between the coils.

3. Using a small flat screwdriver push down on the lock to push it into the groove. Continue in a circular rotation. Do not try to spin the lock in.

2. Insert tang into groove. Slightly twist your wrist towards the groove angling the lock downward into the groove.

Pin Lubrication and Installation 1. Use a high quality engine assembly lube such as Torco between the pin and pin bore. Failure to properly lubricate may result in pin seizure. 2. Do not use grease when lubricating the pin bore. Grease acts as a dam and prevents oil from getting to the pin. 3. Special note for Sportster, Pan, Knuckle and Shovelhead: Both .791” and .792” diameter pins were used in these engines. Check pin fit in rod bushing before installing piston. It should slide in freely just like in the piston. If it does not the rod bushing will need to be reamed to .0006” - .0008” clearance. Installation Rings Top Two: Always use a ring expander tool to stretch rings over the piston, expand ring only enough to get ring over piston. NEVER SPIRAL COMPRESSION RINGS ON

Oil Support Rail Application where the wrist pin is intersecting the oil groove require an Oil Support Rail to bridge the gap the wrist pin cut out has made. All three of the oil control rings are then installed on top of the Support Rail. Special Note: The raised dimple on the Support Rail is positioned down and indexed in the open area of the wrist pin cut out. Offset Pin Orientation All FORGED pistons are supplied with offset wrist pins. Offset pins are designed to help control piston slap noise. The short offset side must always be towards the thrust face side of the engine which is to the rear of the bike.

Support Rail

Dimple

Raised side down

Front Cyl Thrust Face

Rear Cyl Thrust Face

Clockwise engine rotation from right side of bike

Helpful Dimensions

Cylinder Length Gasket to Gasket

Case Deck Hgt

Rod Length

74” Panhead

5.375” 5.375” 5.070” 5.375” 5.375” 6.000”

5.330” + .200” Fire Ring 5.330” + .200” Fire Ring 5.330” + .167” Fire Ring

7.440” 7.440” 7.440” 6.926” 7.440” 7.667”

80” Shovelhead Ironhead Sportster

Evo Sportster

4.650” 5.550” 4.937”

80” EVO

Twin Cam 88”–110”

Hypereutectic Alloy | Forged

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TECH TIPS & INSTALLATION , continued

Installation of 883cc to 1200cc Conversion and 1340cc Pop-up These pistons have asymmetrical valve reliefs and head designs. Put the intakes to the center of the engine and the quench toward the carburetor.

1340cc Pop-Up

883cc to 1200cc Conversion

Carburetor

Carburetor

Front Piston

Installation of Sportster Domes The pistons are marked front and rear. Intakes toward the middle of the engine. Dome toward the carburetor.

Carburetor

Rear Piston

Installation of Motorcycle Piston with Symmetrical and Asymmetrical Valve Reliefs

When installing KB Motorcycle Pistons that have symmetrical valve reliefs, the piston can be turned so either valve is pointing toward the center of the engine. The piston can be fit in ei- ther the front or rear cylinder.

If the piston has symmetrical valve reliefs but has a relief cut in the skirt tip, the cut relief must be oriented toward the center of the engine. The piston can be fit in either the front or rear cylinder. Piston skirt tip clearance should always be checked. When installing KB Motorcycle Pistons that have asymmetrical valve reliefs (intake larger than exhaust), the intake should always be oriented toward the center of the engine. The piston can be in either the front or rear cylinder. Symmetrical Valve Relief Asymmetrical Valve Relief Cut Relief on Skirt

Center

Front

Intake

Rear

Center

Hypereutectic Alloy | Forged

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SHOVELHEAD INSTALLATION TIPS

80” thru 98” Shovelhead Stock and Big Bore Oil Drain Back Hole Clearance Check. Step 1 Measure from top of cylinder to top of oil drain back hole in cylinder. Step 2 Install piston without rings and place cylinder with base gasket over piston then rotate to Bottom Dead Center.

Measure from top of cylinder to top of outer step on piston.

Step 3

With piston back out of cylinder, measure from top of outer step on piston to bottom of oil ring grove.

Step 4

Bottom of Oil Ring Groove

Add 3 and 4 together.

Step 5

Subtract 1 from 5; this will be the clearance number.

Step 6

If the oil ring is allowed to go down into the drain back hole it may get overloaded with oil that it can not control which will result in high oil consumption.

Note

Top of Drain Back Hole

Calculating Deck Clearance and Required Piston Compresion Height 1. Measure cylinder length, gasket surface to gasket surface.

Deck Clearance

.200” Fire Ring

2. Fire ring height, typical is .200”

Head Gasket

3. Base gasket thickness.

4. Deck Height, centerline of crank to cylinder gasket surface. Stock Shovelhead is 5.375”

Cylinder Length

5. Add 1, 2, 3 and 4 (this is your Case/Cylinder stack-up)

6. Half stroke

7. Rod length, stock Shovelhead rod is 7.440”

Base Gasket

8. Piston compression height, centerline of pin to outer step on top of piston. (you will find the comp. hgt. on KB pistons listed in the catalog in the header of each listing)

Case

5.375” Case Hgt.

9. Add 6, 7 and 8 (this is your crank, rod and piston stack-up)

10. Subtract 9 from 5. (this is your deck clearance.)

1/2 Stroke

For easy compression ratio calculator go to www.uempistons.com then TOOLS to calculator. Or call the Tech line at 800-648-7970 ex 3.

Hypereutectic Alloy | Forged

Motorcycle Pistons | 5

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HYPEREUTECTIC SERIES

SPORTSTERS EVOLUTION KNUCKLE, PAN & SHOVELHEAD TWIN CAM ‘88 TWIN CAM ‘96 INDIAN 3.000 3.812 3.188 3.812 3.498 3.812

Mini Grooves to reduce scuffing if overheated

Fully Machined head and valve reliefs

Accumulator Groove aids with compression ring seal

Spiral Lock style lock rings

Diamond finished skirts

CNC machined pin bores produce straight and accurately sized bores

SPORTSTERS

Sportster 54ci / 883cc 1986–Present Bore Stroke Rod Comp Hgt.

Ring Pack

Pin

Oversizes

6.929

1.210

2 - 1.5mm 1 - 2.8mm

.791 /

STD .010 .020 .030 .040

Centered

Piston Head Type/CC Flat Top with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB408C

9.0:1

Piston 253

Hypereutectic Coated Skirts.

w/49cc

+1.2cc

Pin 77

Alloy

Stock replacement piston.

Replacement Parts

2M6198 Ring Set

Pin #

RRN-81 Lock #

Oil Ring Support

0791X216K

Not Used

Sportster Ironhead 61ci / 1000cc 1972–85 Bore Stroke Rod Comp Hgt.

Ring Pack

Pin

Oversizes

7.440

1.182

2 - 1/16 1 - 3/16

.792 /

STD .010 .020 .030 .040 .050

Centered

Piston Head Type/CC Dome with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB292

8.2

Piston 335 Hypereutectic Cut back Dome for

w/110cc

-48.9cc

Pin 97

Alloy

improved combustion

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M7003

0792X216K

RRN-81

Not Used

EVO-Sportster 1200XL 1988–Present / 1100cc 1986–87 Bore Stroke Rod Comp Hgt. Ring Pack

Pin

Oversizes

6.926

1.210

2 - 1/16 1 - 3/16

.792 /

STD .005 .010 .020 .030 .040

Centered

Piston Head Type/CC Flat Top with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB264

9.0:1

Piston 349

Hypereutectic

w/69cc

+0.8cc

Pin 97

Alloy

KB295

8.9:1

Flat Top with

Piston 349

Hypereutectic .044” deeper valve

w/69cc

+1.6cc

Pin 97

Alloy

pockets than KB264

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M6127

0792X216K

RRN-81

R-102 / STD .005 .010 .020 R-103 / .030; R-104 / .040

Hypereutectic Alloy

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SPORTSTERS , continued

EVO-Sportster 74ci / 883 to 1200 Conversion 1986–Present Bore Stroke Rod Comp Hgt. Ring Pack Pin

INDIAN TWIN CAM ‘96 TWIN CAM ‘88 KNUCKLE, PAN & SHOVELHEAD EVOLUTION SPORTSTERS

Oversizes

3.498

3.812

6.926

See Notes

2 - 1/16 1 - 3/16

.792 /

STD .005 .010 .020 .030 .040

Centered

Piston Head Type/CC Flat Top with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB410

9.0:1

Piston 310

Hypereutectic Piston is .125” below

w/51cc 10.0:1 w/51cc

+0.05cc

Pin 97

Alloy

deck, 1.090” Comp Hgt

KB272

Dish with

Piston 335

Hypereutectic 1.210” Compression

+10cc

Pin 97

Alloy

Hgt.

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M6127

0792X216K

RRN-81

R-102 / STD .005 .010 .020 R-103 / .030;

R-104 / .040

Sportster XR1200 and BUELL 1200 2008–Present Bore Stroke Rod Comp Hgt. Ring Pack

Pin

Oversizes

3.498

3.812

6.926

1.210

2 - 1/16 1 - 3/16

.792 /

STD .005 .010 .020 .030 .040

Centered

Piston Head Type/CC Dome with

Comp. Ratio with Head CC 9.2:1 w/69cc 10.1:1 w/62cc 11:1 w/55cc

Part #

Gram Wgt.

Material

Notes

KB414

Piston 360

Hypereutectic Can be used with

-1cc

Pin 97

Alloy

XL1200 Heads

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M6127

0792X216K

RRN-81

R-102 / STD .005 .010 .020 R-103 / .030;

R-104 / .040

EVOLUTION

Evolution 80ci 1340cc 1984–99 Stock Bore and Stroke Bore Stroke Rod Comp Hgt. Ring Pack

Pin

Oversizes

3.498

4.250

7.440

1.375

2 - 1/16 1 - 3/16

.792 /

STD .005 .010 .020 .030 .040

Centered

Piston Head Type/CC Flat Top with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB258

8.6:1

Piston 350

Hypereutectic

w/80cc

+0.8cc

Pin 97

Alloy

KB305

9.6:1

Dome with

Piston 392

Hypereutectic Solid Dome

w/80cc 10.5:1 w/80cc

-9cc

Pin 97

Alloy

KB266

Dome with

Piston 360

Hypereutectic Hollow Dome

-16.5cc

Pin 97

Alloy

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M6127

0792X216K

RRN-81

Not Used

Hypereutectic Alloy

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SPORTSTERS EVOLUTION KNUCKLE, PAN & SHOVELHEAD TWIN CAM ‘88 TWIN CAM ‘96 INDIAN KNUCKLE, PAN & SHOVELHEAD Knuckle, Pan and Shovelhead 74ci FL,FLH,FX 1941–79 Bore Stroke Rod Comp Hgt. Ring Pack Pin Part # Piston Head Type/CC Comp. Ratio with Head CC 3.437 3.969 7.440 1.450 2 - 1/16 1 - 3/16 KB263 Hemi Dome 8.0:1 w/112cc with -42.3cc Pin 97 2M6482 0792X216K 2M6127.STD 0792X216K 2M6127.010 0792X216K 2M6127.020 0792X216K Ring Set Pin # Replacement Parts Shovelhead 88-98ci 1948–84 BIG BORE STROKER 4.250” to 4.750” Bore Stroke Rod Comp Hgt. Ring Pack Pin Part # Piston Head Type/CC Comp. Ratio with Head CC Gram Wgt. 3.625 4.250 - 4.750 7.44 1.285 2 - 1/16 .792 / 1 - 3/16 Centered KB294 Hemi Dome 8.5:1 w/117cc Piston 357 with -42.3cc 9.4:1 w/117cc Pin 97 2M5721 0792X216K RRN-81 Ring Set Pin # Lock # Replacement Parts Shovelhead 80ci FL,FLH,FX 1978–84 Bore Stroke Rod Comp Hgt. Ring Pack Pin Part # Piston Head Type/CC Comp. Ratio with Head CC Gram Wgt. 3.498 4.250 7.440 1.285 2 - 1/16 .792 / 1 - 5/32 Centered KB288 Hemi Dome 7.2:1 Piston 357 with -29.3cc w/117cc Pin 97 KB297 Hemi Dome 8.3:1 Piston 388 with -45.4cc w/117cc Pin 97 2M6127 Prior to 2011 0792X216K RRN-81 2M6164 2012–Current 0792X216K RRN-81 Ring Set Pin # Lock # Replacement Parts Gram Wgt. .792 / Centered Piston 370 RRN-81 RRN-81 RRN-81 RRN-81 Lock #

Oversizes

STD .005 .010 .020 .030 .040 .050

.060 .070 .080

Material

Notes

Hypereutectic 8.0:1 at .063” Deck

Alloy

Clearance;

Piston Oversizes

STD .005 .010 .020 .030 .040 .050

.060 .070 .080

Oversizes

STD .005 .010 .020 .030 .040

Material

Notes

Hypereutectic 7.2:1 at -.085” Deck

Alloy

Clearance. See page 5.

Hypereutectic 8.3:1 at -.085” Deck

Alloy

Clearance. See page 5.

Oil Ring Support

Not Used Not Used

Oversizes

STD .005 .010 .020 .030 .040

Material

Notes

Hypereutectic 8.5:1 w/ 4.250 stroke

Alloy

-.085” deck clearance 9.38:1 w/ 4.750 stroke -.085” deck clearance

Oil Ring Support

Not Used

Hypereutectic Alloy

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TWIN CAM 88”

Twin Cam 88ci 1998–06 Stock Bore and Stroke Bore Stroke Rod Comp Hgt. Ring Pack

INDIAN TWIN CAM ‘96 TWIN CAM ‘88 KNUCKLE, PAN & SHOVELHEAD EVOLUTION SPORTSTERS

Pin

Oversizes

3.750

4.000

7.667

1.270

2 - 1/16 1 - 5/32

.927 /

STD .005 .010 .020 .030

Centered

Piston Head Type/CC Flat Top with +1cc Dome with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB339

8.8:1

Piston 370 Pin 144 Piston 430 Pin 144

Hypereutectic

w/85cc 10.6:1 w/85cc

Alloy

KB343

Hypereutectic

-16.8cc

Alloy

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M4793

0927X300K

PRJ100-3

Not Used

Twin Cam 95” / Big Bore 88” 1998–06 Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack

Pin

Oversizes

3.875

4.000

7.667

1.270

2 - 1/16 1 - 3/16

927 /

STD .005 .010 .020 .030 .040

Centered

Piston Head Type/CC Flat Top with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB348

9.3:1

Piston 408 Pin 102 Piston 447 Pin 102

Hypereutectic

w/85cc 10.5:1 w/85cc

+1cc

Alloy

KB411

Dome with

Hypereutectic Replaces KB374

-11.2cc

Alloy

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M4985

0927X216K

PRJ100-3

R-108 / STD .005 .010 .020 R-109 / .030 .040

Hypereutectic Alloy

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TWIN CAM 96”

SPORTSTERS EVOLUTION KNUCKLE, PAN & SHOVELHEAD TWIN CAM ‘88 TWIN CAM ‘96 INDIAN Twin Cam 103” / Big Bore 96” 2007–Present Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack Pin Part # Piston Head Type/CC Comp. Ratio with Head CC 3.875 4.375 7.667 1.076 2 - 1.5mm 1 - 2.5mm KB409C Flat Top with 10.0:1 +1.9cc w/85cc 2M4941 0927X300K Ring Set Pin # Replacement Parts INDIAN Indian Power Plus 100ci Bore Stroke Rod Comp Hgt. Ring Pack Pin Part # Piston Head Type/CC Comp. Ratio with Head CC 3.875 4.250 7.440 1.400 2 - 1/16 1 - 3/16 KB412 Flat Top with 10.0:1 +2.9cc w/83cc Pin 89 2M4985 0792X208K Ring Set Pin # Replacement Parts

Oversizes

.927 /

STD .005 .010 .020 .030 .040

Centered

Gram Wgt.

Material

Notes

Piston 371 Pin 102

Hypereutectic See instructions for

Alloy

coated piston clearances

Lock #

Oil Ring Support

PRJ100-3

Not Used

Oversizes

.792 /

STD .005 .010 .020 .030 .040

Centered

Gram Wgt.

Material

Notes

Piston 455

Hypereutectic Replaces 2315

Alloy

Lock #

Oil Ring Support

RRN-81

Not Used

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FORGED SERIES

4032 Alloy with 11% silicon

Mini Grooves to reduce scuffing if overheated

Fully Machined head and valve reliefs

EVO-SPORTSTER KNUCKLE, PAN & SHOVELHEAD EVOLUTION TWIN CAM ‘88 TWIN CAM ‘96

Accumulator Groove aids with compression ring seal

Spiral Lock style lock rings

Diamond finished skirts

Anti –Friction skit coatings on numbers that end with a “C”

CNC machined pin bores produce straight and accurately sized bores

EVO-SPORTSTER

Evo - Sportster 883 to 1200 Conversion 1986–Present Bore Stroke Rod Comp Hgt. Ring Pack

Pin

Oversizes

3.498

3.812

6.926

1.208

2 - 1/16 1 - 5/32

.791 / Offset

STD .005 .010 .020 .030 .040

Piston Head Type/CC Dish with +18.1cc

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB922C

9.0:1

Piston 359

Coated Forged

w/51cc

Pin 97

4032 Alloy

All numbers come with dual valve reliefs so they may be used with either a 883 or 1200 head. Compression ratios are listed with 883 head. See instructions for coated piston clearances.

KB923C

9.5:1

Dish with +13.7cc

Piston 365

Coated Forged

w/51cc

Pin 97

4032 Alloy

KB924C

10.0:1 w/51cc

Dish with + 9.8cc

Piston 371

Coated Forged

Pin 97

4032 Alloy

KB925C

10.5:1 w/51cc

Dish with +6.3cc

Piston 377

Coated Forged

Pin 97

4032 Alloy

KB935C

11.0:1

Flat Top

Piston 384

Coated Forged

w/883 head @ 51cc 9.0:1 w/1200 head @ 69cc

+1cc

Pin 97

4032 Alloy

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M6127 Prior to 2011 2M6164 2012–Current

0791X216K

RRN-81

Evo - Sportster 1200XL 1988–Present Bore Stroke Rod Comp Hgt.

Ring Pack

Pin

Oversizes

3.498

3.812

6.926

1.208

2 - 1/16 1 - 5/32

.791 / Offset

STD .005 .010 .020 .030 .040

Piston Head Type/CC

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB935C

9.0:1

Flat Top

Piston 384

Coated Forged See instructions for 4032 Alloy coated piston clearances.

w/1200 head @ 69cc

+1cc

Pin 97

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M6164 2012–Current

0791X216K

RRN-81

Forged

Motorcycle Pistons | 11

800-648-7970 • 775-882-7790

Shovelhead 80ci FL,FLH,FX 1978–84 Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack EVO-SPORTSTER KNUCKLE, PAN & SHOVELHEAD EVOLUTION TWIN CAM ‘88 TWIN CAM ‘96 Shovelhead 88-98ci 1948–84 BIG BORE STROKER Bore Stroke Rod Comp Hgt. Ring Pack Part # Piston Head Type/CC 3.625 4.250 - 4.750 7.44 *1.285 2 - 1/16 **1.175 1 - 3/16 * KB928 Hemi Dome with -42.3cc ** KB658C Hemi Dome 9.0:1 with -42.3cc * KB929 Hemi Dome with -53.6cc ** KB659C Hemi Dome 10.2:1 with -53.6cc * KB930 Hemi Dome with -58.2cc KNUCKLE, PAN & SHOVELHEAD Knuckle, Pan and Shovelhead 74ci FL,FLH,FX 1941–79 Bore Stroke Rod Comp Hgt. Ring Pack Pin Part # Piston Head Type/CC Comp. Ratio with Head CC 3.437 3.969 7.440 1.450 2 - 1/16 1 - 3/16 KB931 Hemi Dome 8.5:1 with -47.6cc w/112cc Pin 97 KB932 Hemi Dome 9.0:1 with -52.7cc w/112cc Pin 97 2M6482 0791X216K Ring Set Pin # Replacement Parts Part # Piston Head Type/CC Hemi Dome with -47.4cc Hemi Dome with -58cc Comp. Ratio with Head CC 3.498 4.250 7.44 1.285 2 - 1/16 1 - 3/16 KB926 8.6:1 w/117cc Pin 97 KB927 9.5:1 w/117cc Pin 97 2M6127 0791X216K Ring Set Pin # Replacement Parts Pin Comp. Ratio w/ 117cc Head 8.5:1 to 9.4:1 9.5:1 to 10.5:1 10.0:1 to 11.5:1

Oversizes

.791 / Offset

STD .005 .010 .020 .030 .040 .050

.060 .070 .080

Gram Wgt.

Material

Notes

Piston 456

Forged

8.5:1 at -.085 deck

4032 Alloy clearance

Piston 470

Forged

9.0:1 at -.085 deck

4032 Alloy clearance

Lock #

Oil Ring Support

RRN-81

Not Used

Pin

Oversizes

.791 / Offset

STD .005 .010 .020 .030 .040

Gram Wgt.

Material

Notes

Piston 416

Forged

8.6:1 at -.085 deck

4032 Alloy clearance

Piston 449

Forged

9.5:1 at -.085 deck

4032 Alloy clearance

Lock #

Oil Ring Support

RRN-81

Not Used

Oversizes

.791 / Offset

STD .005 .010 .020 .030 .040

Gram Wgt.

Material

Notes

When used w/4.500” & 4.750” stroke longer cylinders or stroker plates must be used. Designed for stock length 5.330” cylinders and 4.500” stroke. Coated skirts. When used w/4.500” & 4.750” stroke longer cylinders or stroker plates must be used. Designed for stock length 5.330” cylinders and 4.500” stroke. Coated skirts. When used w/4.500” & 4.750” stroke longer cylinders or stroker plates must be used.

Piston 440

Forged 4032 Alloy

Pin 97

Piston 423

Forged 4032 Alloy

Pin 97

Piston 470

Forged 4032 Alloy

Pin 97

Piston 453

Forged 4032 Alloy

Pin 97

Piston 484

Forged 4032 Alloy

Pin 97

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M5721

0791X216K

RRN-81

Not Used

Forged

12 | KB Pistons

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EVOLUTION

Evolution 80ci 1984–99 Bore Stroke

Rod

Comp Hgt.

Ring Pack

Pin

Oversizes

EVO-SPORTSTER KNUCKLE, PAN & SHOVELHEAD EVOLUTION TWIN CAM ‘88 TWIN CAM ‘96

3.498

4.250

7.440

1.375

2 - 1/16 1 - 3/16

.792 / Offset

STD .005 .010 .020 .030 .040

Piston Head Type/CC Dish with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB919

8.5:1

Piston 365

Forged 4032 Alloy Forged 4032 Alloy

w/80cc

+2.1cc

Pin 97

KB920

9.5:1

Dome with

Piston 390

-8.5cc

w/80cc

Pin 97

KB921

10.5

Dome with

Piston 380

Forged

Hollow Dome

w/80cc

-16.7cc

Pin 97

4032 Alloy Design

Replacement Parts

2M6127 Ring Set

Pin #

RRN-81 Lock #

Oil Ring Support

0792X216K

Not Used

TWIN CAM 88” Twin Cam 95” / Big Bore 88” 1999–06 Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack

Pin

Oversizes

3.875

4.000

7.667

1.263

2 - 1.5mm 1 - 2.5mm

.927 / Offset

STD .005 .010 .020 .030 .040

Piston Head Type/CC Dome with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB904C

9.25:1 w/85cc

Piston 350

Coated Forged

-1.0cc

Pin 89

4032 Alloy

See instructions for coated piston clearances.

KB905C

10.0:1 w/85cc

Dome with

Piston 370

Coated Forged

-6.7cc

Pin 89

4032 Alloy

KB906C

10.5:1 w/85cc

Dome with

Piston 382

Coated Forged

-11.3cc

Pin 89

4032 Alloy

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M4941

0927X208K

PRJ100-3

Not Used

Twin Cam 107” / Big Bore 88” 1999–06 Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack

Pin

Oversizes

4.125

4.000

7.667

1.263

2 - 1.5mm 1 - 3.0mm

.927 / Offset

STD .005 .010 .020 .030

Piston Head Type/CC Dish with

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB910C

9.5:1

Piston 400 Coated Forged See instructions for

w/85cc

+9.4cc

Pin 89

4032 Alloy coated piston clearances

KB911C

10.0:1 w/85cc

Dish with +3.6cc

Piston 384

Coated Forged

Pin 89

4032 Alloy

Stock 88” case must be machined for 4.125” cylinders

KB912C

10.5:1 w/85cc

Dome with

Piston 401

Coated Forged

-1.5cc

Pin 89

4032 Alloy

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M5157

0927X208K

PRJ100-3

Not Used

Forged

Motorcycle Pistons | 13

800-648-7970 • 775-882-7790

TWIN CAM 96”

Twin Cam 103” / Big Bore 96” 2007–Present Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack Pin EVO-SPORTSTER KNUCKLE, PAN & SHOVELHEAD EVOLUTION TWIN CAM ‘88 TWIN CAM ‘96 Twin Cam 110” / Big Bore 96” 2007–Present Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack Pin Part # Piston Head Type/CC Comp. Ratio with Head CC 4.000 4.375 7.667 1.076 2 - 1.5mm 1 - 2.5mm KB913C Dish with 9.5:1 +13.3cc w/85cc Pin 89 KB914C Dish with 10.0:1 +7.1cc w/85cc Pin 89 KB915C Flat Top with 10.5:1 +1.8cc w/85cc Pin 89 * KB661C Dome with 10.0:1 -4.2cc w/95cc Pin 88 2M5080 0927X208K Ring Set Pin # Replacement Parts Part # Piston Head Type/CC Dish with Comp. Ratio with Head CC 3.875 4.375 7.667 1.076 2 - 1.5mm 1 - 2.5mm KB907C 9.5:1 +6.9cc w/85cc Pin 89 KB908C Flat Top with 10.0:1 w/85cc +1.9cc Pin 89 KB909C Dome with 10.5:1 w/85cc -3.6cc Pin 89 * KB660C Dome with 10.0:1 w/95cc -9.8cc 2M4941 0927X208K Ring Set Pin # Replacement Parts

Oversizes

.927 / Offset

STD .005 .010 .020 .030

Gram Wgt.

Material

Notes

Piston 335

Coated Forged

4032 Alloy

See instructions for coated piston clearances.

Piston 317

Coated Forged

4032 Alloy

Piston 335

Coated Forged

4032 Alloy

Coated Forged *Designed for

Piston 369 Pin 106

Screamin’ Eagle 95cc Heads

4032 Alloy

Lock #

Oil Ring Support

PRJ100-3

Not Used

Oversizes

.927 / Offset

STD .005 .010 .020 .030

Gram Wgt.

Material

Notes

Piston 350 Coated Forged

Stock 96” case must be machined for 4” bore cylin- ders. Direct replacement pistons for factory 110” engines.

4032 Alloy

Piston 356

Coated Forged

4032 Alloy

Piston 354

Coated Forged

4032 Alloy

Coated Forged *Designed for

Piston 397

Screamin’ Eagle 95cc Heads

4032 Alloy

Lock #

Oil Ring Support

PRJ100-3

Not Used

Twin Cam 117”, next page …

Forged

14 | KB Pistons

uempistons.com • tech@uempistons.com

TWIN CAM 96” , continued

Twin Cam 117” / Big Bore 96” 2007–Present Stock Stroke Bore Stroke Rod Comp Hgt. Ring Pack Pin

Oversizes

EVO-SPORTSTER KNUCKLE, PAN & SHOVELHEAD EVOLUTION TWIN CAM ‘88 TWIN CAM ‘96

4.125

4.375

7.667

1.076

2 - 1.5mm 1 - 3.0mm

.927 / Offset

STD .005 .010 .020 .030

Piston Head Type/CC Dish with +19.0cc

Comp. Ratio with Head CC

Part #

Gram Wgt.

Material

Notes

KB916C

9.5:1

Piston 377

Coated Forged

Stock 96” case must be machined for 4.125” bore cylinders. See instructions for coated piston clearances.

w/85cc

Pin 89

4032 Alloy

KB917C

10.0:1 w/85cc

Dish with +11.5cc

Piston 375

Coated Forged

Pin 89

4032 Alloy

KB918C

10.5:1 w/85cc

Dish with +7.2cc

Piston 369

Coated Forged

Pin 89

4032 Alloy

* KB662C

10.0:1 w/95cc

Coated Forged *Designed for

Dome with

Piston 410

Screamin’ Eagle 95cc Heads

-1.5cc

Pin 88

4032 Alloy

Replacement Parts

Ring Set

Pin #

Lock #

Oil Ring Support

2M5157

0927X208K

PRJ100-3

Not Used

Forged

Motorcycle Pistons | 15

800-648-7970 • 775-882-7790

APPLICATION LISTING

Application

Part # KB264 KB295

Type

Head Type FT +.8cc FT +1.6cc

Comp. Ratio

Ring Type

Page #

Evo-Sportster 1100/1200 Evo-Sportster 1100/1200 Evo-Sportster 1200XL Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200

9.0:1 8.9:1 9.0:1 9.0:1 9.0:1 9.5:1 10.0:1 10.0:1 10.5:1 11.0:1

2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-5/32 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-5/32 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1.5m, 1-2.8m 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1/16, 1-5/32 2-1/16, 1-5/32 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m

pg. 6 pg. 6

Hyper Hyper Forged Hyper Hyper Forged Forged Forged Forged Forged Hyper Hyper Hyper Forged Forged Forged Hyper Hyper Forged Forged Hyper Hyper Forged Forged Hyper Forged Forged Forged Forged Forged Hyper Hyper Hyper Forged Forged Forged Hyper Hyper Hyper Hyper Forged Forged Forged Hyper Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged

KB935C

pg. 11

FT +1cc

KB272 KB410

Dish +10cc FT +.05cc Dish +18.1cc Dish +13.7cc Dish +9.8cc Dish +6.3cc Dome -16.5cc Dome -9cc Dish +2.1cc Dome -8.5cc Dome -16.7cc Hemi -42.3cc Hemi -47.6cc Hemi -52.7cc Hemi -29.3cc Hemi -45.4cc Hemi -47.4cc Hemi -58cc Hemi -42.3cc Hemi -42.3cc Hemi -53.6cc Hemi -58.2cc Hemi -42.3cc Hemi -53.6cc Dome -48.9cc Dome -1.0cc Dish +9.4cc Dish +3.6cc Dome -1.5cc FT+2.9cc FT +1.2cc Dome -11.1cc Dome -1.0cc Dome -6.7cc Dome -11.3cc Dome -9.8cc Dish +6.9cc Dish +1.9cc Dome -3.6cc Dome -4.2cc Dish +13.3cc Dish +7.1cc Dish +1.8cc Dome -1.5cc Dish +19.0cc Dish +11.5cc Dish +7.2cc FT +1.9cc FT +1cc FT +.8cc FT +1cc Dome -16.8cc FT +1cc

pg. 7 pg. 7

KB922C KB923C KB924C KB925C KB935C

pg. 11 pg. 11 pg. 11 pg. 11 pg. 11

KB258 KB266 KB305 KB919 KB920 KB921 KB412 KB263 KB931 KB932 KB288 KB297 KB926 KB927 KB294 KB928 KB929 KB930

Evolution 80ci Evolution 80ci Evolution 80ci Evolution 80ci Evolution 80ci Evolution 80ci

8.6:1

pg. 7 pg. 7 pg. 7

10.5:1

9.6:1 8.5:1 9.5:1

pg. 13 pg. 13 pg. 13 pg. 10

10.5:1 10.0:1

Indian Power Plus 100ci Knuckle, Pan, Shovel Knuckle, Pan, Shovel Knuckle, Pan, Shovel

8.0:1 8.5:1 9.0:1 7.2:1 8.3:1 8.6:1 9.5:1

pg. 8

pg. 12 pg. 12

Shovelhead 80ci Shovelhead 80ci Shovelhead 80ci Shovelhead 80ci

pg. 8 pg. 8

pg. 12 pg. 12

Shovelhead 88ci to 98ci Shovelhead 88ci to 98ci Shovelhead 88ci to 98ci Shovelhead 88ci to 98ci

8.5 to 9.4:1 8.5 to 9.4:1 9.5 to 10.5:1 10.0 to 11.5:1

pg. 8

pg. 12 pg. 12 pg. 12 pg. 12 pg. 12

KB658C KB659C KB408C

Shovelhead 88-98ci Shovelhead 88-98ci

9.0:1

10.2:1

Sportster 54ci

9.0:1 8.2:1

pg. 6 pg. 6 pg. 7

KB292 KB414

Sportster Ironhead Sportster XR1200 Twin Cam 88 (107ci) Twin Cam 88 (107ci) Twin Cam 88 (107ci) Twin Cam 88 (88ci) Twin Cam 88 (88ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (117ci) Twin Cam 96 (117ci) Twin Cam 96 (117ci) Twin Cam 96 (117ci)

10.1:1

KB910C KB911C KB912C

9.5:1

pg. 13 pg. 13 pg. 13

10.0:1 10.5:1

KB339 KB343 KB348 KB411

8.8:1

pg. 9 pg. 9 pg. 9 pg. 9

10.6:1

9.3:1

10.5:1 9.25:1 10.0:1 10.5:1 10.0:1 10.0:1 10.0:1 10.5:1 10.0:1 10.0:1 10.5:1 10.0:1 9.5:1 9.5:1

KB904C KB905C KB906C KB409C KB660C KB907C KB908C KB909C KB661C KB913C KB914C KB915C KB662C KB916C KB917C KB918C

pg. 13 pg. 13 pg. 13 pg. 10 pg. 14 pg. 14 pg. 14 pg. 14 pg. 14 pg. 14 pg. 14 pg. 14 pg. 15 pg. 15 pg. 15 pg. 15

9.5:1

10.0:1 10.5:1

Hypereutectic Alloy | Forged

16 | KB Pistons

uempistons.com • tech@uempistons.com

NUMERICAL LISTING

Part # KB258 KB263 KB264 KB266 KB272 KB288 KB292 KB294 KB295 KB297 KB305 KB339 KB343 KB348

Application

Type

Head Type

Comp. Ratio

Ring Type

Page #

8.6:1 8.0:1 9.0:1

2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-5/32 2-1/16, 1-5/32 2-1/16, 1-3/16 2-1.5m, 1-2.8m 2-1.5m, 1-2.5m 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-3.0m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-2.5m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1.5m, 1-3.0m 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-3/16 2-1/16, 1-5/32 2-1/16, 1-5/32

pg. 7 pg. 8 pg. 6 pg. 7 pg. 7 pg. 8 pg. 6 pg. 8 pg. 6 pg. 8 pg. 7 pg. 9 pg. 9 pg. 9 pg. 6

Evolution 80ci

FT +.8cc

Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged

Knuckle, Pan, Shovel Evo-Sportster 1100/1200

Hemi -42.3cc

FT +.8cc

Evolution 80ci

Dome -16.5cc Dish +10cc Hemi -29.3cc Dome -48.9cc Hemi -42.3cc

10.5:1 10.0:1

Evo-Sportster 883 to 1200

Shovelhead 80ci Sportster Ironhead

7.2:1 8.2:1

Shovelhead 88ci to 98ci Evo-Sportster 1100/1200

8.5 to 9.4:1

FT +1.6cc

8.9:1 8.3:1 9.6:1 8.8:1

Shovelhead 80ci Evolution 80ci Twin Cam 88 (88ci) Twin Cam 88 (88ci) Twin Cam 88 (95ci)

Hemi -45.4cc Dome -9cc

FT +1cc

Dome -16.8cc

10.6:1

FT +1cc

9.3:1 9.0:1

KB408C KB409C

Sportster 54ci

FT +1.2cc FT +1.9cc FT +.05cc

Twin Cam 96 (103ci)

10.0:1

pg. 10

KB410 KB411 KB412 KB414

Evo-Sportster 883 to 1200

9.0:1

pg. 7 pg. 9

Twin Cam 88 (95ci)

Dome -11.1cc

10.5:1 10.0:1 10.1:1 10.2:1 10.0:1 10.0:1 10.0:1 9.25:1 10.0:1 10.5:1 9.0:1

Indian Power Plus 100ci

FT+2.9cc

pg. 10

Sportster XR1200 Shovelhead 88-98ci Shovelhead 88-98ci Twin Cam 96 (103ci) Twin Cam 96 (110ci) Twin Cam 96 (117ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 88 (107ci) Twin Cam 88 (107ci) Twin Cam 88 (107ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (117ci) Twin Cam 96 (117ci) Twin Cam 96 (117ci)

Dome -1.0cc Hemi -42.3cc Hemi -53.6cc Dome -9.8cc Dome -4.2cc Dome -1.5cc Dome -1.0cc Dome -6.7cc Dome -11.3cc Dish +6.9cc Dish +1.9cc Dome -3.6cc Dish +9.4cc Dish +3.6cc Dome -1.5cc Dish +13.3cc Dish +7.1cc Dish +1.8cc Dish +19.0cc Dish +11.5cc Dish +7.2cc Dish +2.1cc Dome -8.5cc Dome -16.7cc Dish +18.1cc Dish +13.7cc Dish +9.8cc Dish +6.3cc Hemi -47.4cc Hemi -58cc Hemi -42.3cc Hemi -53.6cc Hemi -58.2cc Hemi -47.6cc Hemi -52.7cc

pg. 7

KB658C KB659C KB660C KB661C KB662C KB904C KB905C KB906C KB907C KB908C KB909C KB910C KB911C KB912C KB913C KB914C KB915C KB916C KB917C KB918C

pg. 12 pg. 12 pg. 14 pg. 14 pg. 15 pg. 13 pg. 13 pg. 13 pg. 14 pg. 14 pg. 14 pg. 13 pg. 13 pg. 13 pg. 14 pg. 14 pg. 14 pg. 15 pg. 15 pg. 15 pg. 13 pg. 13 pg. 13 pg. 11 pg. 11 pg. 11 pg. 11 pg. 12 pg. 12 pg. 12 pg. 12 pg. 12 pg. 12 pg. 12 pg. 11 pg. 11

9.5:1

10.0:1 10.5:1

9.5:1

10.0:1 10.5:1

9.5:1

10.0:1 10.5:1

9.5:1

10.0:1 10.5:1

KB919 KB920 KB921

Evolution 80ci Evolution 80ci Evolution 80ci

8.5:1 9.5:1

10.5:1

KB922C KB923C KB924C KB925C

Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200

9.0:1 9.5:1

10.0:1 10.5:1

KB926 KB927 KB928 KB929 KB930 KB931 KB932

Shovelhead 80ci Shovelhead 80ci

8.6:1 9.5:1

Shovelhead 88ci to 98ci Shovelhead 88ci to 98ci Shovelhead 88ci to 98ci Knuckle, Pan, Shovel Knuckle, Pan, Shovel Evo-Sportster 883 to 1200

8.5 to 9.4:1 9.5 to 10.5:1 10.0 to 11.5:1

8.5:1 9.0:1

KB935C KB935C

FT +1cc FT +1cc

11.0:1

Evo-Sportster1200XL

9.0:1

Hypereutectic Alloy | Forged

Motorcycle Pistons | 17

800-648-7970 • 775-882-7790

DIAMETRICAL LISTING

Bore 3.000 3.188 3.437 3.437 3.437 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.498 3.625 3.625 3.625 3.625 3.625 3.625 3.750 3.750 3.875 3.875 3.875 3.875 3.875 3.875 3.875 3.875 3.875 3.875 3.875 4.000 4.000 4.000 4.000 4.125 4.125 4.125 4.125 4.125 4.125 4.125

Comp. Hgt.

Part #

Application

Type

Head Type FT +1.2cc

Page #

KB408C

1.210 1.182 1.450 1.450 1.450 1.375 1.210 1.375 1.210 1.285 1.210 1.285 1.375 1.090 1.210 1.375 1.375 1.375 1.208 1.208 1.208 1.208 1.285 1.285 1.208 1.208 1.285 1.175 1.175 1.285 1.285 1.285 1.270 1.270 1.270 1.076 1.270 1.400 1.076 1.263 1.263 1.263 1.076 1.076 1.076 1.076 1.076 1.076 1.076 1.076 1.263 1.263 1.263 1.076 1.076 1.076

Sportster 54ci

pg. 6 pg. 6 pg. 8

Hyper Hyper Hyper Forged Forged Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Hyper Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Hyper Forged Forged Forged Forged Forged Hyper Hyper Hyper Hyper Hyper Hyper Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged Forged

KB292 KB263 KB931 KB932 KB258 KB264 KB266 KB272 KB288 KB295 KB297 KB305 KB410 KB414 KB919 KB920 KB921

Sportster Ironhead Knuckle, Pan, Shovel Knuckle, Pan, Shovel Knuckle, Pan, Shovel

Dome -48.9cc Hemi -42.3cc Hemi -47.6cc Hemi -52.7cc

pg. 12 pg. 12

Evolution 80ci

FT +.8cc FT +.8cc

pg. 7 pg. 6 pg. 7 pg. 7 pg. 8 pg. 6 pg. 8 pg. 7 pg. 7 pg. 7

Evo-Sportster 1100/1200

Evolution 80ci

Dome -16.5cc Dish +10cc Hemi -29.3cc

Evo-Sportster 883 to 1200

Shovelhead 80ci

Evo-Sportster 1100/1200

FT +1.6cc

Shovelhead 80ci Evolution 80ci

Hemi -45.4cc Dome -9cc

Evo-Sportster 883 to 1200

FT +.05cc

Sportster XR1200

Dome -1.0cc Dish +2.1cc Dome -8.5cc Dome -16.7cc Dish +18.1cc Dish +13.7cc Dish +9.8cc Dish +6.3cc Hemi -47.4cc

Evolution 80ci Evolution 80ci Evolution 80ci

pg. 13 pg. 13 pg. 13 pg. 11 pg. 11 pg. 11 pg. 11 pg. 12 pg. 12 pg. 11 pg. 11 pg. 12 pg. 12 pg. 12 pg. 12 pg. 12 pg. 10 pg. 14 pg. 13 pg. 13 pg. 13 pg. 14 pg. 14 pg. 14 pg. 14 pg. 14 pg. 14 pg. 14 pg. 15 pg. 13 pg. 13 pg. 13 pg. 15 pg. 15 pg. 15 pg. 8 pg. 9 pg. 9 pg. 9 pg. 10 pg. 9

KB922C KB923C KB924C KB925C

Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200 Evo-Sportster 883 to 1200

KB926 KB927

Shovelhead 80ci Shovelhead 80ci

Hemi -58cc

KB935C KB935C

Evo-Sportster 883 to 1200 Evo-Sportster 1200XL Shovelhead 88ci to 98ci

FT +1cc FT +1cc

KB294

Hemi -42.3cc Hemi -42.3cc Hemi -53.6cc Hemi -42.3cc Hemi -53.6cc Hemi -58.2cc

KB658C KB659C

Shovelhead 88-98ci Shovelhead 88-98ci

KB928 KB929 KB930 KB339 KB343 KB348

Shovelhead 88ci to 98ci Shovelhead 88ci to 98ci Shovelhead 88ci to 98ci Twin Cam 88 (88ci) Twin Cam 88 (88ci) Twin Cam 88 (95ci) Twin Cam 96 (103ci) Twin Cam 88 (95ci) Twin Cam 96 (103ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 88 (95ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 96 (103ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (110ci) Twin Cam 96 (117ci) Twin Cam 88 (107ci) Twin Cam 88 (107ci) Twin Cam 88 (107ci) Twin Cam 96 (117ci) Twin Cam 96 (117ci) Twin Cam 96 (117ci) Indian Power Plus 100ci

FT +1cc

Dome -16.8cc

FT +1cc

KB409C

FT +1.9cc

KB411 KB412

Dome -11.1cc

FT+2.9cc

KB660C KB904C KB905C KB906C KB907C KB908C KB909C KB661C KB913C KB914C KB915C KB662C KB910C KB911C KB912C KB916C KB917C KB918C

Dome -9.8cc Dome -1.0cc Dome -6.7cc Dome -11.3cc Dish +6.9cc Dish +1.9cc Dome -3.6cc Dome -4.2cc Dish +13.3cc Dish +7.1cc Dish +1.8cc Dome -1.5cc Dish +9.4cc Dish +3.6cc Dome -1.5cc Dish +19.0cc Dish +11.5cc Dish +7.2cc

Hypereutectic Alloy | Forged

18 | KB Pistons

uempistons.com • tech@uempistons.com